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MDEV-30524 btr_cur_t::open_leaf() opens non-leaf page in BTR_MODIFY_LEAF mode

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btr_cur_t::open_leaf(): When we have to reopen the root page in
a different mode, ensure that we will actually acquire a latch upfront,
instead of using RW_NO_LATCH. This prevents a race condition where
the index tree would be split between the time we released the
root page S latch and finally acquired a latch in
mtr->upgrade_buffer_fix(), actually on a non-leaf root page.

This race condition was introduced in
commit 89ec4b53ac (MDEV-29603).
This commit is contained in:
Marko Mäkelä 2023-01-31 16:38:11 +02:00
parent c3a5cf2b5b
commit ccafd2d49d
1 changed files with 1 additions and 0 deletions
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storage/innobase/btr/btr0cur.cc
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@ -1890,6 +1890,7 @@ dberr_t btr_cur_t::open_leaf(bool first, dict_index_t *index,
ut_ad(root_leaf_rw_latch != RW_NO_LATCH);
upper_rw_latch= root_leaf_rw_latch;
mtr->rollback_to_savepoint(savepoint);
height= ULINT_UNDEFINED;
continue;
}
else